Operation; Troubleshooting; Water Is Spitting From The Nozzles On The Uprights; Steam Does Not Discharge From The Distributors When The Valve Is Open - Carel ultimateSAM SA Series User Manual

Operationally, the ultimateSAM Humidification System discharges steam
into the duct or air handler. The method by which the steam discharge is
controlled depends upon whether the steam comes from a pressurized
source or an atmospheric source. For pressurized steam supplies, the
steam flow rate is controlled by the valve/actuator. The control valve opens
or closes in response to a control signal that is sent to the actuator. Both
electronic and pneumatic actuators are configured so that there is a linear
relationship between the steam flow rate and the control signal.
6.1 Water is spitting from the nozzles on the
uprights
1. The header P-traps are not draining. Clean and check plumbing.
Check that height of trap exceeds the static pressure of the duct/AHU,
especially if under negative pressure.
2.
The steam trap on the valve/trap assembly is not functioning. Clean or
replace.
3. The steam line has been taken from the bottom of the steam source or
is not sloped properly. Change line to take off from the top and check
proper slopes.
4.
The steam main is overloaded with water. Locate cause and Correct if
necessary.
5.
Check valve sizing to maximum distributor capacity. Resize valve within
distributor capacity.
6.2 Steam does not discharge from the
distributors when the valve is open
1.
Verify that valve is open. Correct if necessary.
2.
Verify that steam is available and valves are open. Correct if necessary.
3.
Verify that the steam pressure has not changed. Too high pressure
could jam the valve.
4. Carefully place a mirror or metal object close to one of the steam
discharge slots. If it fogs, steam is discharging, but evaporating very
quickly. No problem. NEVER PLACE YOUR HAND OVER OR NEAR THE
STEAM DISCHARGE NOZZLES.
5.
The Y-strainer may be clogged. Clean or replace.

6.3 Steam valve will not open

1.
Verify power or air pressure to the valve actuator. Correct if necessary.
2. Verify control signal or pressure range to the valve actuator. Correct if
necessary.
3.
Verify control signal polarity to the valve actuator. Correct if necessary.
4.
Remove actuator and test to see if it operates. Valve may be jammed -
clean or replace.
5.
Verify that the steam pressure has not changed. Too high pressure
could jam the valve.
6.
Verify proper valve orientation - electric valves must face up.

6.4 Steam valve will not close

1.
Verify control signal to the valve actuator. Correct if necessary.
2.
Verify control signal polarity to the valve actuator. Correct if necessary.
3.
Remove actuator and test to see if it operates. Valve may be jammed -
clean or replace.
4. Verify that the steam pressure has not changed. Too high pressure
could jam the valve.
5.
Verify proper valve orientation - electric valves must face up.

5. OPERATION

For atmospheric steam supplies, the flow rate is controlled by the rate at
which the humidifier produces steam. All of the steam generated by the
humidifier is discharged by the ultimateSAM distributor into the duct or
AHU.
The control signal for the actuator or atmospheric humidifier is either
generated by a humidistat or a humidity sensor and controller. The controller
can be either stand-alone or part of a Building Automation System.

6. TROUBLESHOOTING

6.5 Steam valve is leaking

1.
2.
3.
4.

6.6 Humidity exceeds set point

1.
2.
3.
4.
5.
6.
7.
8.

6.7 Humidity remains below set point

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
21
Verify full range control signal to the valve actuator. Correct if necessary.
Verify control signal polarity to the valve actuator. Correct if necessary.
Remove actuator and test to see if it operates. Valve may be jammed -
clean or replace.
Verify that the steam pressure has not changed. Too high pressure
could jam the valve.
Verify full range control signal to the valve actuator is compatible.
Correct if necessary.
Verify control signal polarity to the valve actuator. Correct if necessary.
Check calibration of controller. Correct if necessary.
Insure humidity sensors are installed correctly and not located in drafts
(wall). Correct if necessary.
Remove actuator and test to see if it operates. Valve may be jammed -
clean or replace.
Verify that the steam pressure has not changed. Too high pressure
could cause valve to leak.
Verify stable boiler pressure. Wide swings in pressure could be fighting
the humidity controls.
From BAS system, change to P type control (not PI or PID).
Verify full range control signal to the valve actuator is compatible.
Correct if necessary.
Verify control signal polarity to the valve actuator. Correct if necessary.
Check calibration of controller. Correct if necessary.
Insure humidity sensors are installed correctly and not located in drafts
(wall). Correct if necessary.
Remove actuator and test to see if it operates. Valve may be jammed -
clean or replace.
Verify that the steam pressure has not changed. Too high pressure
could jam valve. Too low will not meet capacity.
Verify stable boiler pressure. Wide swings in pressure could be fighting
the humidity controls.
From BAS system, change to P type control (not PI or PID).
Check that air flow switch is not fluttering. Correct if necessary.
Check that hi-limit controller is not located too close to steam discharge
distributors. Correct if necessary.
Humidifier is undersized. Check humidity load calculations.
"ultimateSAM - user" +03U0070EF - rel. 2.0 - 20150301
ENG